在串联N-酰化/分子内[4 + 2]环加成反应中,使用马来酸,焦油酸和柠康酸酐以及呋喃基丙烯酰基,研究了糠醛胺的乙烯基化合物,可从呋喃丙烯醛(3-(呋喃基)烯丙胺)分两步轻松获得。和肉桂酰氯。通过在温和的条件下使用3-(呋喃基)烯丙胺和α,β-不饱和酸酐的多米诺反应,可以有效地合成各种六氢-4 H-呋喃[2,3- f ]异吲哚及其羧基衍生物。多米诺序列包括三个步骤:3-(呋喃基)烯丙胺中氮原子的酰化,分子内Diels-Alder环加成反应生成的N-酰基乙烯基呋喃(IMDAV反应),加合物发生质子转移,然后恢复呋喃核的芳香性。关键步骤,IMDAV反应,非对映选择性地产生目标产物呋喃[2,3- f ]异吲哚,并具有相对较高的收率。
在串联N-酰化/分子内[4 + 2]环加成反应中,使用马来酸,焦油酸和柠康酸酐以及呋喃基丙烯酰基,研究了糠醛胺的乙烯基化合物,可从呋喃丙烯醛(3-(呋喃基)烯丙胺)分两步轻松获得。和肉桂酰氯。通过在温和的条件下使用3-(呋喃基)烯丙胺和α,β-不饱和酸酐的多米诺反应,可以有效地合成各种六氢-4 H-呋喃[2,3- f ]异吲哚及其羧基衍生物。多米诺序列包括三个步骤:3-(呋喃基)烯丙胺中氮原子的酰化,分子内Diels-Alder环加成反应生成的N-酰基乙烯基呋喃(IMDAV反应),加合物发生质子转移,然后恢复呋喃核的芳香性。关键步骤,IMDAV反应,非对映选择性地产生目标产物呋喃[2,3- f ]异吲哚,并具有相对较高的收率。
New and efficient approaches to the semisynthesis of taxol and its C-13 side chain analogs by means of β-lactam synthon method
作者:Iwao Ojima、Ivan Habus、Mangzhu Zhao、Martine Zucco、Young Hoon Park、Chung Ming Sun、Thierry Brigaud
DOI:10.1016/s0040-4020(01)91210-4
日期:1992.1
Highly efficient chiral ester enolate-imine condensation giving 3-hydroxy-4-aryl-β-lactams with excellent enantiomericpurity is successfully applied to the asymmetric synthesis of the enantiomerically pure taxol C-13 side chain, N-benzoyl-(2R,3S)-3-phenyl-isoserine and itsanalogs. (3R,4S)-N-benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone readily derived from the 3-hydroxy-4-phenyl-β-lactam is coupled
New and efficient routes to norstatine and its analogs with high enantiomeric purity by β-Lactam Synthon Method
作者:Iwao Ojima、Young Hoon Park、Chung Ming Sun、Thierry Brigaud、Mangzhu Zhao
DOI:10.1016/0040-4039(92)89019-9
日期:1992.9
Norstatine and itsanalogs, i.e., 3-amino-2-hydroxyalkanoic acids, with highenantiomericpurity are obtained through effecient asymmetric synthesis of 3-silyloxy-β-lactams by chiral enolate - imine cyclocondensation, followed by hydrolysis.